Data Sheet

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AEAS-84AD 14/12 Bit Multi-turn Encoder Module

Data Sheet

General Description

Features

The AEAS-84AD provides all functions as an optoelectronicmechanical unit in order to implement with AEAS-7000 an absolute multi-turn encoder with a combine capacity of up to 30 bits.

• 16384 (14bits) and 4096 (12bits) revolution count versions

The unit consists of an IR-LED circuit board, a phototransistor (PT) circuit board, and 6 or 7 code wheels arranged in between the PCBs.

• Operating temperatures of -40°C to +85°C

Specifications The multi-turn unit is available in the following versions: • 12-bit solid shaft • 14-bit solid shaft

Applications • Major component of Multi-turn housed encoder • Cost effective solution for direct integration into OE systems • Linear positioning system

• Optical, absolute multi-turn assembly with max. Ø55 mm and typical height 11.9 mm. • Mechanical coupling by means of gearwheels with module of 0.3 • Operating speeds up to 12,000 rpm • A 2x4-pole pin strip for power supply and signals • 5V +/-10% power supply with low power consumption • Code wheel-like multiplexing of the digital position data

Benefits • No battery or capacitor required for number of revolution counting during power failure • Immediate position detection on power up

Pinning SEE Detail1 Detail1 

1





8







Pins allocation: 1. GND . MTDAT . MTDAT1 . MTDAT0 . MTMUX . MTMUX1 . MTMUX0 8. VCC

8. Side View

Bottom View

Note: 3rd angle viewing Example of matching connector: MPE GARRY 521 Series, No. BL21-43GGG-008 Figure 1. Pin Configuration

Block Diagram and Detailed Description In the following descriptions, the I/O pins are enclosed by a box, e.g., MTMUX[2:0] .

VCC (+V)

x  PT's

x  IR's



1 of 8-Decoder

MTMUX[:0]

 x 100K  x K  x K



 

MTDAT[:0]

Comparator GND

Figure 2. Block Diagram



Multiplexing and Position Data The 3-bit codes of the code wheels 1 to 7 are output on MTDAT[2:0] de-multiplexed with MTMUX[2:0]. Here, the binary value on MTMUX[2:0] corresponds to the codewheel number (1 = code wheel 1, 2 = code wheel 2, etc.). The configuration is displayed with the value “0.”

Each of the 1:4 reduced 7 code wheels generates a 3-bit code, from which the 14-bit Gray code can be generated as position data through V-bit processing. The 3-bit code is identical electrically for all code wheels, only the projection on the mechanical angle (the revolutions) is different according to the 1:4 divisions. The code and the data bits and V-bits to be generated are shown in the following diagram for the code wheel 1: Shaft Turns

0

1







MSB Singleturn 1. Wheel Turns

0

1

1. MTDAT[0] 1. MTDAT[1] 1. MTDAT[] Gray Code (generated) Data-Bit1 Data-Bit V-Bit Figure 3. Multiplexing Diagram for gear wheel 1

The following table shows the assignments: Table 1. Demultiplexing Diagram for all gear wheels



Bin/Dec MTMUX[2:0]

MTDAT[2]

001 / 1 010 / 2 to 111 / 7

3-bit code wheel 1 3-bit code wheel 2 to 3-bit code wheel 7

000 / 0

always 1

MTDAT[1]

MTDAT[0]

0 = 12 bit 1 = 14 bit

1 = MU1xSS

Gray code-generation

Logic Diagram

For the readout schematic of the multi-turn code gears, i.e. with the user’s micro-controller, there must be a logical replication of the V-bit multiplexers. This can be done by a bit manipulation or by look up tables. Care needs to be taken with the real time readout conditions.

From MTDAT-Demux (Code-Wheel x)

x MUX

Cx[]

0

V

Y

Cx[1]

(V-Bit)

1 S

The procedure is as follows : 0

1. The 3 bits (MTDAT[2:0] of each gear (C1[2:0] bits C7[2:0]) are continuously de-multiplexed. Thus there are maximal 3bits x 7gears = 21Bit AEAS-84AD-Data in parallel.

D

Y

(Data-Bit)

1S

2. Synchronous to the readout of the AEAS-7000 sensor, those AEAS-84AD bits (depending on the MSB bit (1.SELbit) of the AEAS-7000) needs to be complemented to the complete Gray code word (cascading).

XOR 0 Y

Cx[0]

1 S

3. The bit change of the complete Gray code will be synchronized by the AEAS-7000 and thus electronically eliminating gear play.

0

D1

Y

(Data-Bit1)

1S

The logic diagram for ONE gear is shown in the following diagram (V-bit-Multiplexer), Figure 4.

SEL

Truth Table SEL

Cx[0] Cx[1] Cx[]

D1

D

V

0 0 1 1

0 1 1 1

0 0 0 1

0 0 0 0

0 0 1 1

0 0 0 0

0 0 0 0

0 0 1 1

1 0 0 0

1 1 1 1

0 0 0 1

1 1 0 0

1 1 1 1

0 0 0 0

0 0 1 1

0 1 1 1

1 1 1 0

1 1 1 1

0 0 1 1

1 1 1 1

1 1 1 1

0 0 1 1

1 0 0 0

0 0 0 0

1 1 1 0

1 1 0 0

0 0 0 0

1 1 1 1

Figure 4. Logic Diagram and Truth Table for one of the gear



The following diagram shows the cascading of the V-bitMultiplexer of all gears. The outputs are the 14bits Gray code in parallel. The MSB of the complete code is dependant on the total resolution of the system. It can be used in steps of 2 bits (14Bit,12Bit,…etc). Unused higher bits should be masked to logical zero. With the data-multiplexer IC version of the multi-turn encoder module, the data multiplexer IC will perform the complete driving and data processing of the encoder units while maintaining all time constraints.

There is an IC available to combine both the AEAx-7x00 13/16-bit single turn component and the AEAx- 84AD 12/14bit multiturn module into one-single powerful multiturn absolute encoder. This one-stop solution enables the design of a high-end absolute encoder with minimum component count at integration level. Figure 6 shows an application example of integration of single-turn absolute encoder and multiturn module using MUIC. Note: To simplify the synchronization with singleturn absolute encoder(e.g. AEAS-7000), the total solution has been embedded into a single chip - MUIC. Please refer to the Ordering Information for this device.

V-Bit-Multiplexer-Cascade C[] Demuxed Code-Wheel 

C[1] C[0]

Cx[]

V

Cx[1]

D

Cx[0]

D1

Gray-Bit1 Gray-Bit1 (MSB for 1Bit) Gray-Bit1

SEL

C[] Demuxed Code-Wheel 

C[1] C[0]

Cx[]

V

Cx[1]

D

Cx[0]

D1

Gray-Bit1 Gray-Bit11 (MSB for 1Bit) Gray-Bit10

SEL

C[] Demuxed Code-Wheel 

C[1] C[0]

Cx[]

V

Cx[1]

D

Cx[0]

D1

Gray-Bit9 Gray-Bit8

SEL

C[] Demuxed Code-Wheel 

C[1] C[0]

Cx[]

V

Cx[1]

D

Cx[0]

D1

Gray-Bit Gray-Bit

SEL

C1[] Demuxed Code-Wheel 1

C1[1] C1[0]

Cx[]

V

Cx[1]

D

Cx[0]

D1

SEL Sample AEAS-000 MSB

Figure 5. The cascading of V-bit-Multiplexer of all gear wheels



Gray-Bit1 Gray-Bit0

Application Example of Multiturn Absolute Encoder VCC +5 V

5 V REGULATOR

BIT SETTINGS ARE APPLICATION SPECIFIC MT-CONFIG. 14/16

+2FF

CODE

MT-ST CR 100 n 100 n

AEAx-84AD

3

VCC MTMUX MTDAT

1

CFG 3

3x 1 K

3

1

N2L16

1

SRADD2

LM317L +2.5 V

1

GRAY

MTDIR

VDDI GND VDDa 100 n 470R

100 n 470R

VB+

GND

VB-

VB-

DRIVER

FFOUT

IN OUT+

STROBE

3x 100 K

VB+

VOUT VIN VREG

MTMUX(2:0) MTDAT(2:0)

+5 V

DE

OUT-

DATA+ DATA-

GND OPTOCOUPLER

MU-IC1

AEAx-7x00 DOUT SCL

N2SCL N2NSL

DIN

N2DIN

DCLK

LTC1799-SOT23-5

CLKQ HCLK

PRESC (3:0)

MFFREQ MFTIME (1:0) (5:0)

RSET DIV

CLK-

IN

SERIAL INTERFACE

MCLR

4

2

6 1/6 HC14

RESET TIME SHOULD BE RELATED TO OSCILLATOR STARTUP TIME

SINGLEGATE RESONATOR /2..63

10 K

5 4

1/6 HC14

BIT SETTINGS ARE APPLICATION SPECIFIC

10 K (10 MHz)

Figure 6. Application example of integration of single-turn absolute encoder module and multiturn module using MUIC.



CR

RESET CIRCUIT EXAMPLE MHz ..16

HCLK/ H/1/8/64 1..16

GND

OUT

MSBINV

CLOCK OSCILLATOR EXAMPLES

3

CLK+

IN-

CR-INPUT

MHz 16..32

VDD OUT

IN+

2x 1/8 HC14

N2MSBINV

MSBINV

2

OUT

SRCLK

N2DOUT

NSL

1

2x 1/8 HC14

Electrical Specifications Absolute Maximum Ratings Symbol

Parameter

Limits

Units

VCC

DC Supply Voltage

-0.3 to +6.0

V

Vi

Input Voltage

-0.5 to +5.5

V

Vo

Output Voltage

-0.5 to +VCC +0.5

V

%RH

Moisture Level (Non-Condensing)

85

%

Tstg

Storage Temperature

-40 to +100

°C

Note : This device meets the ESD ratings of the IEC61000-4-2 HBM Level 4 (8KV)

Recommended Operating Conditions Symbol

Parameter

Values

Units

VCC

DC Supply Voltage

+4.5 / +5.0 / +5.5

V

Tamb

Ambient Temperature

-40 to +85

°C

tDMUXRD

Delay Multiplex Read

64

µs

SRPM

Encoder Shaft r.p.m

max 12,000

1/min

DC Characteristics VCC = 4.5 to 5.5 V / Tamb = -40 to +85°C Symbol VOH VOL VIH VIL IIL / IIH ICC

Parameter MTDAT[2:0] Output High Voltage (10K Pull-up) MTDAT[2:0] Output Low Voltage (4K7 Series-R) Input High Voltage Input Low Voltage MTMUX[2:0] Input Current., VIN=VCC or 0V VCC Supply Current

Min 4.0

IOH = -50µA

Values Typ.

IOL = 50µA VCC=4.5V VCC=5.5V

Max

Units V

0.4

V

3.2 3.9

100K Pull-down

V

-10 10

0.8 100

V µA

20

mA

Timing Characteristics VCC= 4.5 to 5.5V / Tamb = -40 to +85°C Values Symbol

Parameter

tR / tF

Input Transition Rise-/Fall-Time

tDMUXRD SRPM MTMUX[:0]

Max

Units

500

ns

Delay Multiplex Read

57

µs

Encoder Shaft r.p.m

12K

1/min

old value

Min 0.8V / 3.0V

Typ

new value

t DMUXRD

MTDAT[:0]



old value

new value

Application Note The encoder is mechanically fixed by means of holes in adapters, which accommodate M3 threads. The encoder has 2 adapters for attaching in a 3 x 120° and 4 x 90° arrangement (for details see the mechanical drawings in the following page). The mechanical coupling of the encoder shaft is realised by means of gearwheels with a module of 0.3, 14 teeth.

The zero positions of the coupling wheels are locked with a plastic plug for alignment to the AEAS-7000, with the coupling wheel being able to compensate for an angle error of about +/-7°. The electrical connection is realized by means of a 2x4 pin strip (1.27mm pitch), which is plugged into a corresponding female connector. The encoder is attached with a plastic plug that locks the absolute zero position. During the mating of the gearwheel and the encoder coupling wheel it may be necessary to align the teeth of the gears for proper matching. The plastic plug can be removed upon integration with the gearwheel.

Figure 7. Mechanical coupling with Multiturn Encoder Module

Mechanical Drawing

.8

.

.±.1

∅.0

11.9±.

.1±.1  - ∅.

.

.

.±.1

.±.1

9. .1±.1

.±.1 . (Dimensions are in millimeters) Figure 8. Package dimensions

8.

Ordering Information AEAS-84AD-LBSC0

multi-turn, solid shaft, serial, 12 bit

AEAS-84AD-LBSF0

multi-turn, solid shaft, serial, 14 bit

Ordering information for MUIC: MUIC1-V0 leaded, industrial temperature range +85°C MUIC1-V0-X79 lead-free, industrial temperature range +85°C Note:

The manufacturer contact for the above MUIC part numbers is as follows: OPTOLAB Microsystems AG Konrad-Zuse-Str.14 DE-99099 Erfurt / Germany Phone: +49-361-55144-0 Fax: +49-361-55144-50

For product information and a complete list of distributors, please go to our web site: www.avagotech.com Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies, Pte. in the United States and other countries. Data subject to change. Copyright © 2006 Avago Technologies Pte. All rights reserved. 5989-1203EN - April 7, 2006